1.

The de-Broglie wavelength of electgron in 3^(rd) orbit of He^(+1) ion is approximately

Answer»

`2A^(@)`
`3A^(@)`
`4A^(@)`
`5A^(@)`

SOLUTION :`2pir=nlamda`
`lamda=(2pir)/(N)=(2pixx(0.529A^(@))(n^(2))/(z))/(n)`
`lamda=(0.529A^(@))(n^(2))/(z)=2pixx(0.529A^(@))(3)/(2)`
`lamda=3pixx0.529A^(@)~~5A^(@)`


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